Initial growth and oxygen adsorption of silver on Al2O3 film
Initial growth and oxygen adsorption of silver on Al2O3 film
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Al2O3 薄膜上银的初始生长和氧吸附
DOI：
10.1021/jp066842n
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发表时间：
2007-03-15
影响因子：
3.7
通讯作者：
Bao, Xinhe
中科院分区：
文献类型：
--
作者：
Guo, Donghui;Guo, Qinlin;Bao, Xinhe
利用X射线光电子能谱、紫外光电子能谱和低能电子衍射等技术，在超高真空条件下原位研究了在Mo(110)基底上制备的有序Al2O3薄膜上Ag的生长和氧吸附。结果表明，初始覆盖时，氧化铝薄膜上形成了Ag颗粒/团簇，并且由于尺寸效应，Ag团簇的Ag 3d(5/2)线结合能高于块状Ag。将银簇暴露于类似于 10(-7) mbar O-2 的环境中会导致簇在基底上扩散。在许多应用领域中，了解氧引起的金属团簇形态和尺寸变化的起源非常重要。
The growth and oxygen adsorption of Ag on an ordered Al2O3 film, prepared on Mo(110) substrate, have been studied in situ under ultrahigh-vacuum condition using X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and low-energy electron diffraction. The results show that Ag particles/clusters are formed on alumina film at initial coverages, and the binding energy of the Ag 3d(5/2) line for Ag clusters is higher than that of bulk Ag, arisen from the size effect. Exposure of Ag clusters to similar to 10(-7) mbar O-2 leads the clusters to spreading over the substrate. It is of importance in many application areas to understand the origin of oxygen-induced metal-cluster changes in morphology and size.